Which expression has a value of 18 when n=7?

Mathematics

2 answers:

Lorico [155]3 years ago

8 0

Hello There!

I'm sure it is B. 6n - 24

Hope This Helps You!
Good Luck :)

- Hannah ❤

snow_lady [41]3 years ago

6 0

Check all the options by plugging n = 7

50 - 3(7) = 50 - 21 = 29 (not possible)

6(7) - 24 = 42 - 24 = 18 (possible)

So correct option is B

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Please Help!

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Diagonal of the parallelogram divides the parallelogram in to two equal areas.

So area of parallelogram = 2(area of triangle)

According to the given diagram,

AB= 8, AD = 5 and BD = 11

So according to the Heron's formula,

Area of triangle = $\sqrt{s(s-a)(s-b)(s-c)}\\\\where,\\ s =\frac{a + b + c }{2}$

and a, b and c are the three sides of the triangle

Area of triangle ABD = $s=\frac{8 + 5 + 11}{2} \\\\s = \frac{24}{2}\\\\s = 12Area of triangle ABD = \sqrt{12(12 - 8) (12 - 5) (12 - 11)}\\\\Area of triangle ABD = \sqrt{12(4) (7) (1)}\\\\Area of triangle ABD = \sqrt{336}\\\\Area of triangle ABD = 18.33$